Semester_2/OOP/Lab_06/Exercise1/Circle.java
public class Circle {
    private double radius = 1.0;
    private String color = "red";

    public Circle() {
    }

    public Circle(double radius) {
        this.radius = radius;
    }

    public Circle(double radius, String color) {
        this.radius = radius;
        this.color = color;
    }

    public double getRadius() {
        return this.radius;
    }

    public String getColor() {
        return this.color;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public double getArea() {
        return Math.PI * this.radius * this.radius;
    }
    // @Override
    // public String toString() {

    // }
}